The term 'roof pitch' refers to the angle of a roof's slope, which is typically measured in terms of the number of inches it rises for every 12 inches of horizontal run. The crossword solution for this term is 'TAR, ' which is an acronym for 'TAR and gravel, ' a type of roofing material that is composed of asphalt and gravel. TAR and gravel roofs are often used on flat or low-pitched roofs, as they are relatively inexpensive and easy to install.